What is the Role of the Endoplasmic Reticulum in Cellular Functions?
The ER is a network of membranes within the cell that plays a crucial role in protein synthesis and folding. It is divided into two regions: the rough ER, studded with ribosomes, and the smooth ER, which is involved in lipid and steroid hormone synthesis. The ER is also responsible for maintaining calcium ion concentration, which is vital for various cellular processes, including muscle contraction and cell signaling.
